He's a plant by A.D. Kersch to debunk the X-Files once and for all. Of course, he sees the light, boinks with Scully and will take over for David Duchovny in the future XF movies (just kidding on my second sentence).
I'm interested in how they're going to explain Scully's pregnancy. Rumor on some of the XF mailing lists is there's some footage of Scully and Mulder in a clinch that was supposed to air last year and got cut, but will air in sort of flashback mode this season to explain it all. It's better than the alternative - I don't think I could stomach another alien pregancy storyline.
When I first saw the T2 guy was going to be on the show, I wasn't sure he'd work, but after seeing some of the previews, I'm pleasantly surprised.
IMDB Bio for Edward Furlong, the kid who played John Conner
Eddie was born in Pasedena to Elenor Torres and an unknown father. He didn't have a truly unhappy childhood, but it wasn't the best either. At the age of 13 he shot to stardom with the release of T2. Ever since then his life has been that of a hollywood star. He has starred in several films since then. Eddie has an amazing talent. He is considered one of the most incredible young actors of the decade. Eddie has grown up too fast. It was sad to watch him have to live the life of an adult and make adult decisions at the age of 14 or 15. Eddie is involved in a live-in relationship with his former tutor, Jackie Domac. She is 12 years his senior. Eddie's life can be placed somewhere between tragic and blessed. He has thousands of fans around the world, but he might not be a very happy person.
<edit> there's going to be a T3 in 2002-he's going to play John again </edit>